Gene array analysis reveals a common Runx transcriptional programme controlling cell adhesion and survival

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• Runx genes play critical roles in cellular development and are implicated in various cancers, functioning as either oncogenes or tumor suppressors.
• Ectopic expression of Runx genes in fibroblasts leads to a consistent phenotype, including epithelioid morphology and enhanced stress survival.

Purpose of the Study:

• To compare the effects of ectopic Runx expression on cellular phenotype and gene expression.
• To identify common target genes regulated by Runx proteins.
• To investigate the impact of Runx fusion oncoproteins on gene regulation.

Main Methods:

• Gene array analysis to assess transcriptional changes.
• Filtering of gene array data based on inducible RUNX1-ER regulation.
• In silico prediction and experimental validation of glucocorticoid resistance.
• Testing the effects of RUNX1 fusion oncoproteins in fibroblasts.

Main Results:

• Ectopic Runx expression induced a shared transcriptional signature with overlapping target genes.
• A common set of 50 highly regulated genes showed a bias towards cancer and development roles, particularly affecting cell adhesion.
• Runx expression conferred resistance to glucocorticoid-induced growth inhibition.
• Runx fusion oncoproteins disrupted the regulation of specific target genes rather than imposing constitutive repression.

Conclusions:

• Runx genes significantly influence cell adhesion, survival, and development through shared transcriptional targets.
• The findings elucidate the oncogenic potential of the Runx family.
• Novel therapeutic targets for inhibiting Runx-driven cancers were identified.